1. Tìm x:
a) (2x+5) ² = $\frac{16}{121}$
b) (3x-1) ³ $\frac{-27}{8}$
c) 178.x ² - $7^{9}$ : 98 ³ = $\frac{1}{8}$
d) (x- $\frac{2}{9}$) = ( $\frac{2}{3}$ )$^{6}$
2/
A = $\frac{(\frac{2}{5})^7.5^7+(\frac{9}{4})^3:(\frac{3}{16})^3}{2^7.5^2+512}$
Loga
Sinh Học lớp 12
